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n in (-oo:+oo)
(8-n)/7 = 4/3 // - 4/3
(8-n)/7-(4/3) = 0
(8-n)/7-4/3 = 0
(3*(8-n))/(3*7)+(-4*7)/(3*7) = 0
3*(8-n)-4*7 = 0
-3*n-4 = 0
(-3*n-4)/(3*7) = 0
(-3*n-4)/(3*7) = 0 // * 3*7
-3*n-4 = 0
-3*n-4 = 0 // + 4
-3*n = 4 // : -3
n = 4/(-3)
n = -4/3
n = -4/3
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